Revert "Revert "With this change 'tools/test.py -cdartk vm' will run vm tests with Dart Frontend pa…

tools/testing/dart/test_suite.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /**
  * Classes and methods for enumerating and preparing tests.
  *
  * This library includes:
  *
  * - Creating tests by listing all the Dart files in certain directories,
@@ skipping 455 matching lines @@
   }
 
   void testNameHandler(ExpectationSet testExpectations, String testName) {
     // Only run the tests that match the pattern. Use the name
     // "suiteName/testName" for cc tests.
     String constructedName = '$suiteName/$testPrefix$testName';
 
     var expectations = testExpectations.expectations('$testPrefix$testName');
 
     var args = TestUtils.standardOptions(configuration);
+    var compilerConfiguration = new CompilerConfiguration(configuration);
+    if (compilerConfiguration.useDFE) {
+      args.add('--use-dart-frontend');
+      // '--dfe' has to be the first argument for run_vm_test to pick it up.
+      args.insert(0, '--dfe=$buildDir/gen/kernel-service.dart.snapshot');
+    }
     args.add(testName);
 
     var command = CommandBuilder.instance.getProcessCommand(
         'run_vm_unittest', targetRunnerPath, args, environmentOverrides);
     enqueueNewTestCase(
         new TestCase(constructedName, [command], configuration, expectations));
   }
 
   Future<Null> forEachTest(Function onTest, Map testCache,
       [VoidFunction onDone]) async {
@@ skipping 1734 matching lines @@
       }
       if (path.length > WINDOWS_SHORTEN_PATH_LIMIT) {
         ++shortNameCounter;
         var pathEnd = path.substring(path.length - WINDOWS_PATH_END_LENGTH);
         path = "short${shortNameCounter}_$pathEnd";
       }
     }
     return path;
   }
 }